Roland already fixed the vexpress-v2p-ca9:
 > Upstream DTS commit 62a5017bf825c9e4d317 ("ARM: dts: vexpress: specify
 > AFS partition") [1] introduced an empty node at /smb@4000000
 > /motherboard/flash@0,00000000/partitions, which is preferred by the OF
 > partitions parser over the single partition nodes. In the same commit,
 > upstream set the compatible to "arm,arm-firmware-suite", which barebox
 > does not know about. Adapt our fixed partition setup accordingly by
 > wrapping all partitions in an extra "partitions" node with the correct
 > compatible.
 > [1]: https://git.kernel.org/linus/62a5017bf825c9e4d3176eb975a01c329a9f36

Do the same for the vexpress-v2p-ca15. While at it use the new label:
added along with 6940ba22c66a ("dts: update to v5.3-rc1"). This way we
aren't (build-)broken, when the upstream path changes in v5.8-rc1.

Fixes: 6940ba22c66ac1c71350 ("dts: update to v5.3-rc1")
Cc: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>